The pair first raised eyebrows when they were spotted cozying up at October's Spike TV Scream Awards in L.A. They even shared a quick on-stage smooch when Bosworth, 27, presented Skarsgard with the Best Villain award.

"Kate and Alexander hugged a few times and were often spotted whispering to each other," RadarOnline.com reported of the pair's backstage rapport. She even "playfully slapped him on his butt a few times," according to the site.